Thermodynamic characteristics of the structural modification “forsterite–magnesite”

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According to the current environmental agenda of the Russian Federation, one of the most important tasks of the building materials industry is to find promising areas for integrated processing and increase the share of man-made raw materials, namely industrial waste. This fully applies to mining and processing plants, the waste of which is large-scale man-made raw material deposits. Based on the thermodynamic analysis, the feasibility of the transformation chain saponite→serpentine→forsterite→magnesite is shown by alternating the stages of mechanochemical activation of raw materials and high-temperature modification of intermediates. Chemical schemes of the mechanism of these transformations leading to the production of magnesia astringent compositions are given. The validity of the theoretical calculations has been experimentally confirmed by methods of differential thermal analysis and IR-spectroscopy. Experimental samples were obtained using a binder based on magnesite synthesized from serpentine. An aqueous solution of bischofite was used as the sealing solution. The tests carried out on their mechanical destruction have shown that the synthesized powders exhibit the properties of binders. Thus, the average values of certain parameters (ρ, Rcomp, and KCC) were: 1600 kg/m3; 5.78 MPa and 3.62 (respectively). The results obtained open up a new promising area of using the multi-tonnage waste of the kimberlite ore dressing process to develop technologies for the production of magnesia binders and a wide range of products based on them.

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作者简介

M. Frolova

Lomonosov Northern (Arctic) Federal University

编辑信件的主要联系方式.
Email: m.aizenstadt@narfu.ru

Candidate of Sciences (Chemistry)

俄罗斯联邦, 17, Severnaya Dvina Embankment, Arkhangelsk, 163002

V. Lesovik

Belgorod State Technological University named after V.G. Shukhov

Email: naukavs@mail.ru

Doctor of Sciences (Engineering)

俄罗斯联邦, 46, Kostyukova street, Belgorod, 308012

A. Ayzenshtadt

Lomonosov Northern (Arctic) Federal University

Email: a.isenshtadt@narfu.ru

Doctor of Sciences (Chemistry)

俄罗斯联邦, 17, Severnaya Dvina Embankment, Arkhangelsk, 163002

V. Strokova

Belgorod State Technological University named after V.G. Shukhov

Email: vvstrokova@gmail.com

Doctor of Sciences (Engineering)

俄罗斯联邦, 46, Kostyukova street, Belgorod, 308012

V. Danilov

Lomonosov Northern (Arctic) Federal University

Email: v.danilov@narfu.ru

Candidate of Sciences (Engineering)

俄罗斯联邦, 17, Severnaya Dvina Embankment, Arkhangelsk, 163002

M. Malygina

Lomonosov Northern (Arctic) Federal University

Email: m.turobova@narfu.ru

Engineer, Graduate Student

俄罗斯联邦, 17, Severnaya Dvina Embankment, Arkhangelsk, 163002

参考

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2. Fig. 1. Functional dependence ∆G=f(Т) for the reaction: Mg2SiO4+2H2CO3→2MgCO3+SiO2+2H2O

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3. Fig. 2. Experimental samples sealed with 8% bischofite solution

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4. Fig. 3. DTA of modified serpentine powder

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5. Fig. 4. IR spectrum of modified powder according to the scheme: serpentine→forsterite→magnesite→caustic magnesite

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